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From ca530bb3a0d4fbadc46607ace3082d7a5fb89620 Mon Sep 17 00:00:00 2001
From: Paul Gortmaker <paul.gortmaker@windriver.com>
Date: Sat, 22 Jan 2011 14:43:36 -0500
Subject: [PATCH] lockdep: add no_validate class
This is one of several extractions from the merge up to 33-rc8.
See it in a git tip repo with:
git diff 5f854cfc024622e4aae14d7cf422f6ff86278688^2 \
5f854cfc024622e4aae14d7cf422f6ff86278688 include/linux/lockdep.h
You can find the origin of this change in the tip merge commit:
commit 5f854cfc024622e4aae14d7cf422f6ff86278688
Merge: cc24da0 4ec62b2
Author: Thomas Gleixner <tglx@linutronix.de>
Date: Sun Feb 21 20:17:22 2010 +0100
Forward to 2.6.33-rc8
Merge branch 'linus' into rt/head with a pile of conflicts.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Normally there are not significant changes/additions in a merge commit that
are not from any other "normal" commit. But in this case there are, so
break them out into separate explicit commits.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
drivers/base/core.c | 1 +
include/linux/lockdep.h | 8 ++++++++
kernel/lockdep.c | 14 ++++++++++++++
3 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 45eb57f..00d1425 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -559,6 +559,7 @@ void device_initialize(struct device *dev)
kobject_init(&dev->kobj, &device_ktype);
INIT_LIST_HEAD(&dev->dma_pools);
mutex_init(&dev->mutex);
+ lockdep_set_novalidate_class(&dev->mutex);
spin_lock_init(&dev->devres_lock);
INIT_LIST_HEAD(&dev->devres_head);
device_init_wakeup(dev, 0);
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index a03977a..06aed83 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -44,6 +44,8 @@ struct lock_class_key {
struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES];
};
+extern struct lock_class_key __lockdep_no_validate__;
+
#define LOCKSTAT_POINTS 4
/*
@@ -270,6 +272,9 @@ extern void lockdep_init_map(struct lockdep_map *lock, const char *name,
#define lockdep_set_subclass(lock, sub) \
lockdep_init_map(&(lock)->dep_map, #lock, \
(lock)->dep_map.key, sub)
+
+#define lockdep_set_novalidate_class(lock) \
+ lockdep_set_class(lock, &__lockdep_no_validate__)
/*
* Compare locking classes
*/
@@ -354,6 +359,9 @@ static inline void lockdep_on(void)
#define lockdep_set_class_and_subclass(lock, key, sub) \
do { (void)(key); } while (0)
#define lockdep_set_subclass(lock, sub) do { } while (0)
+
+#define lockdep_set_novalidate_class(lock) do { } while (0)
+
/*
* We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
* case since the result is not well defined and the caller should rather
diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 62921da..32a21cc 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -795,6 +795,12 @@ out_unlock_set:
return class;
}
+#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_TRACE_IRQFLAGS)
+
+/* CHECKME */
+
+#endif /* CONFIG_PROVE_LOCKING || CONFIG_TRACE_IRQFLAGS */
+
#ifdef CONFIG_PROVE_LOCKING
/*
* Allocate a lockdep entry. (assumes the graph_lock held, returns
@@ -2708,6 +2714,8 @@ void lockdep_init_map(struct lockdep_map *lock, const char *name,
}
EXPORT_SYMBOL_GPL(lockdep_init_map);
+struct lock_class_key __lockdep_no_validate__;
+
/*
* This gets called for every mutex_lock*()/spin_lock*() operation.
* We maintain the dependency maps and validate the locking attempt:
@@ -2742,6 +2750,9 @@ static int __lock_acquire(struct lockdep_map *lock, unsigned int subclass,
return 0;
}
+ if (lock->key == &__lockdep_no_validate__)
+ check = 1;
+
if (!subclass)
class = lock->class_cache;
/*
@@ -3584,6 +3595,9 @@ void lockdep_init(void)
for (i = 0; i < CHAINHASH_SIZE; i++)
INIT_LIST_HEAD(chainhash_table + i);
+ /* Hack alert ! */
+ lockdep_set_novalidate_class(&kernel_sem);
+
lockdep_initialized = 1;
}
--
1.7.0.4
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